<!DOCTYPE html>
<html>
  <head>
    <style>
      .con {
        display: flex;
        flex-direction: row;
        width: 20px;
        height: 20px;
        border-radius: 50%;
        background-color: #D8D8D8;
        justify-content: center;
        align-items: center;
        box-sizing: border-box;
        padding-left: 3px;
        
      }
      .bar {
        width: 1px;
        height: 11px;
        margin-right: 4px;
        background-color: #999999;
        animation: growing 1.5s infinite;
      }
      .bar1 {
        animation-delay: 0s;
      }
      .bar2 {
        animation-delay: 0.4s;
      }
      .bar3 {
        animation-delay: 0.6s;
      }
      @keyframes growing {
        0% {
            transform: scaleY(0.5);
        }
        50% {
            transform: scaleY(1);
        }
        100% {
            transform: scaleY(0.5);
        }
      }
    </style>
  </head>
  <body>
    <div class="con">
      <div class="bar bar1"></div>
      <div class="bar bar2"></div>
      <div class="bar bar3"></div>
    </div>
  </body>
</html>
